ISSN 1006-3021 CN11-3474/P
Published bimonthly started in 1979
靖边龙洲波浪式丹霞地貌成因机理初探
投稿时间:2019-10-17  修订日期:2020-01-20
关键词:Jingbian,wave Danxia landform,genesis mechanism
基金项目:(省公益专项基金项目)陕北丹霞地貌地质遗迹详细调查(项目编号:20180201)项目
作者单位E-mail
彭小华 陕西省矿产地质调查中心 pengxiaohua321@126.com 
吴昊 陕西省矿产地质调查中心  
李益朝 陕西省矿产地质调查中心  
祝捷 陕西省矿产地质调查中心  
党晨 陕西省矿产地质调查中心  
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摘要:
Preliminary study on the genetic mechanism of wave Danxia Landform in Longzhou, Jingbian
      Recently, based on the detailed investigation of Danxia landform in Longzhou, which found that the type of Danxia Landform in this area is the transition type of positive-negative landform—Wave Danxia landform. In order to evaluate its value and significance scientifically, this paper mainly discusses the genetic mechanism of the wave Danxia Landform in Longzhou from the aspects of rock characteristics, geological structure characteristics and external dynamic factors. Research shows: First, parallel bedding and large-scale wind-staggered bedding of sandstone of Luohe Formation in the study area have a good shaping effect on the formation of wave Danxia landscape; The purple-red sandstone of Luohe Formation is a set of aeolian desert facies deposits, rocks with poor cementation, low hardness and fragility ,which is the material basis for the formation of wave Danxia landform; Since the late Cretaceous, the Ordos Basin has been tilted and the crust in the area has been generally uplifted, which shows that the Longzhou area in Jingbian has developed multi-level palaeoplanation planes and river terraces, which play a basic role in controlling the formation of wave Danxia landform; There are many sets of joints and fissures in the sandstones of the Luohe Formation in this area,the sandstones of the Luohe Formation are cut into blocks, which play a key role in controlling the formation and transformation of the wave Danxia landform; In terms of the external dynamic factors, Jingbian has a semi-arid inland monsoon climate, obviously transformed by the northwest wind,which is the main external dynamic factor for the formation of wave Danxia landform. In addition, the rainstorm in summer and autumn strongly eroded and eroded the surface strata, the cold wave and frost in spring and autumn, and the rocks were frozen, melted and collapsed, which also played an important role in the formation of Longzhou wavy Danxia landform. In addition to the constraints of geological structure and water erosion, the transformation of micro landform by wind is very obvious, which is the main external dynamic factor and feature of the formation of Danxia Landform in Longzhou, Jingbian. The development stage of wave Danxia Landform in this area can be divided into two stages.
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